These work but I will remove one star for the sensitivity after using. Any drink, hot or cold, will feel strange against your teeth after using. Make sure you only leave them on as long as instructed. Hard to attach the bottom strip and it doesn't conform well to your teeth.

This whitening product has been effective for me multiple times over the past few years. I have used it in correlation with other Crest products (such as toothpaste) and I have seen a noticeable difference. They only negative thing I would have to report is that it occasionally makes me teeth sensitive to heat and cold, but overall, I love the Professional Effects!

These are great if you can use them for a few weeks and aren't looking for immediate results. They don't taste the best and are annoying to have on but I've found that that is the same for most white strips. I recommend these to anybody that doesn't suffer from tooth sensitivity as they can hurt a bit of you wear them for too long.

LOVE THESE!❤️❤️❤️ they're so great! A lot of people say they cause sensitivity, but I never have any after using these. I would suggest not brushing your teeth before applying because that may be what's aggravating your gums causing the sensitivity.

I'm 67 years old and used this whitening product because of an article I read in AARP's magazine that suggested ways to be appealing to your grandchildren. One of the suggestions was that you whiten your teeth. I'd been thinking about it previously so this article was the impetus I needed to buy the product. The effect is great! I plan on doing the strips every year from now on!

This product definitely works. It does not work overnight, but it works within a few weeks. It is really easy to use and apply. However, I have noticed that my teeth definitely do feel a little sensitive to the air/cold after use. I would recommend drinking fluids and drinks with straws to prevent staining because whitening kits do tend to damage the teeth. 

I absolutely love this product! I've been using it for over 6 months now and it's amazing. I will warn those that have sensitive guns and teeth that this product may make them more sensitive the next day. Usually it's temporary. My teeth have never been whiter and it's so easy to use!

Not bad. I think my teeth got marginally whiter after using a box of white strips but it doesn't necessarily last for so long nor am I amazed with the difference. They are pretty expensive and also wearing them is not great either. They leave a gunky plastic taste in your mouth and it's hard to speak and swallow the 30 mins or so you have to keep them on

The first thing about this product is that it is crazy expensive. The packs are way to over priced. Another thing is that after using the stripes, i got very bad tooth pains due to my teeth being super sensitive but the stripes did there overall job.

These whitening strips are easy to use and conveniently packaged to fit easily when traveling or in purse. I really see results after even one use. I gave four stars because the taste is kind of bad and there is a film left on teeth after, however, that seems to be common with all whitening strips. Brushing teeth after gets rid of the film and taste!